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<html lang="zh-cn">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
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</head>
<body>
	<div class="root">
	</div>

	<button type="button">前序遍历</button>
	<button type="button">中序遍历</button>
	<button type="button">后序遍历</button>

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</body>
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